import buildURL from '../helpers/buildURL';
import buildFullPath from '../core/buildFullPath';
import settle from '../core/settle';
import { isUndefined } from '../utils';

/**
 * 返回可选值存在的配置
 * @param {Array} keys - 可选值数组
 * @param {Object} config2 - 配置
 * @return {{}} - 存在的配置项
 */
const mergeKeys = (keys, config2) => {
  let config = {};
  keys.forEach(prop => {
    if (!isUndefined(config2[prop])) {
      config[prop] = config2[prop];
    }
  });
  return config;
};
export default (config) => {
  return new Promise((resolve, reject) => {
    let fullPath = buildURL(buildFullPath(config.baseURL, config.url), config.params);
    const _config = {
      url: fullPath,
      header: config.header,
      complete: (response) => {
        config.fullPath = fullPath;
        response.config = config;
        try {
          // 对可能字符串不是json 的情况容错
          if (typeof response.data === 'string') {
            response.data = JSON.parse(response.data);
          }
          // eslint-disable-next-line no-empty
        } catch (e) {
        }
        settle(resolve, reject, response);
      }
    };
    let requestTask;
    if (config.method === 'UPLOAD') {
      delete _config.header['content-type'];
      delete _config.header['Content-Type'];
      let otherConfig = {
        // #ifdef MP-ALIPAY
        fileType: config.fileType,
        // #endif
        filePath: config.filePath,
        name: config.name
      };
      const optionalKeys = [
        // #ifdef APP-PLUS || H5
        'files',
        // #endif
        // #ifdef H5
        'file',
        // #endif
        // #ifdef H5 || APP-PLUS
        'timeout',
        // #endif
        'formData'
      ];
      requestTask = uni.uploadFile({..._config, ...otherConfig, ...mergeKeys(optionalKeys, config)});
    } else if (config.method === 'DOWNLOAD') {
      // #ifdef H5 || APP-PLUS
      if (!isUndefined(config['timeout'])) {
        _config['timeout'] = config['timeout'];
      }
      // #endif
      requestTask = uni.downloadFile(_config);
    } else {
      const optionalKeys = [
        'data',
        'method',
        // #ifdef H5 || APP-PLUS || MP-ALIPAY || MP-WEIXIN
        'timeout',
        // #endif
        'dataType',
        // #ifndef MP-ALIPAY
        'responseType',
        // #endif
        // #ifdef APP-PLUS
        'sslVerify',
        // #endif
        // #ifdef H5
        'withCredentials',
        // #endif
        // #ifdef APP-PLUS
        'firstIpv4'
        // #endif
      ];
      requestTask = uni.request({..._config,...mergeKeys(optionalKeys, config)});
    }
    if (config.getTask) {
      config.getTask(requestTask, config);
    }
  });
};
